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. Author manuscript; available in PMC: 2020 Jan 1.
Published in final edited form as: Drug Discov Today. 2018 Oct 5;24(1):129–147. doi: 10.1016/j.drudis.2018.09.019

Figure 2.

Figure 2.

Chemical structures of commonly used (a) pH-responsive polymers that undergo pH-dependent conformational changes and (b) acid-labile linkages and their pHresponsive cleavage mechanism.